Alert archive / Delaware / Special Weather Statements in 2015

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2015Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2015, 10:24 PM EDT for Sussex County, Delaware. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 4, 2015, 10:24 PM EDT (02:24 UTC)
Expired: Aug 4, 2015, 11:15 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 24 km from the middle of the area, began a volume at 02:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.4 hours before the alert went out and 78 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 961 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1098 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

714 
WWUS81 KPHI 050224
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1024 PM EDT TUE AUG 4 2015
 
DEZ003-004-050315-
DELAWARE BEACHES-INLAND SUSSEX-
1024 PM EDT TUE AUG 4 2015

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL SUSSEX
COUNTY...

AT 1024 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM NEAR MILTON TO NEAR SEAFORD TO NEAR VIENNA...AND
MOVING EAST AT 30 MPH.

WIND GUSTS UP TO 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THESE
STORMS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. 
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE 
SHELTER INSIDE A BUILDING OR VEHICLE.

THESE STORMS WILL BE NEAR...
  MILTON AROUND 1035 PM EDT.
  GEORGETOWN AND LEWES AROUND 1050 PM EDT.
  MILLSBORO AND HENLOPEN ACRES AROUND 1100 PM EDT.
  LAUREL AROUND 1105 PM EDT.
  SYCAMORE AROUND 1115 PM EDT.

OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE BETHEL...BLADES...
DEWEY BEACH AND LONG NECK.


LAT...LON 3847 7569 3860 7571 3879 7540 3878 7508
      3870 7507 3869 7512 3869 7514 3866 7513
      3863 7517 3858 7529 3847 7564
TIME...MOT...LOC 0224Z 262DEG 24KT 3876 7538 3862 7561 3852 7592 
$$

ROBERTSON

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 8:04 PM EDT	Special Weather Statement	PHI	Cumberland	56 min
Aug 4, 10:07 PM EDT	Special Weather Statement	PHI	Cape May	53 min
Aug 4, 10:30 PM EDT	Areal Flood Advisory	PHI	Cape May	4 hr
Aug 4, 10:40 PM EDT	Special Marine Warning	PHI		50 min
Aug 4, 10:56 PM EDT	Special Weather Statement	PHI	Cape May	19 min
Aug 4, 11:22 PM EDT	Special Marine Warning	PHI		53 min
Aug 4, 10:44 PM EDT	Special Weather Statement	PHI	Talbot	31 min
Aug 4, 11:10 PM EDT	Special Weather Statement	PHI	Caroline, Talbot	50 min
Aug 4, 11:28 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	32 min
Aug 4, 9:01 PM EDT	Special Weather Statement	PHI	New Castle	59 min
Aug 4, 11:06 PM EDT	Special Weather Statement	PHI	Sussex	24 min
Aug 4, 11:18 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Aug 4, 11:35 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 4, 11:43 PM EDT	Special Weather Statement	PHI	Sussex	47 min
Aug 5, 12:04 AM EDT	Special Weather Statement	PHI	Sussex	41 min
Aug 5, 12:39 AM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 5, 12:52 AM EDT	Special Weather Statement	PHI	Sussex	23 min

Nearby

Special Weather Statements in Delaware, 2015 Every special weather statement in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.